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# Vocabulary

### Vocab words for math test

Term | Definition |
---|---|

point | location |

line | 2 or more points (on a line) that extends forever in both directions |

plane | flat surface with 3 or less points |

co-linear points | points on same line |

co-planar points | points on same plane |

line segment | can be measure and has endpoints |

ray | part of a line that goes forever in one direction |

opposite rays | 2 rays with same endpoint and go forever in opposite directions |

angle | 2 non co-linear rays with common endpoint |

vertex | common endpoint of an angle |

obtuse angle | greater than 90 degrees less than 180 degrees |

acute angle | less than 90 degrees greater than 0 degrees |

right angle | exactly 90 degrees |

straight angle | exactly 180 degrees |

adjacent angles | angles that share an endpoint and a side |

angle bisector | ray that divides an angle into 2 congruent angles |

segment bisector | segment line or plane that intersects at a segments midpoint and forms 2 congruent segments |

vertical angles | 2 nonadjacent angles formed by 2 intersecting lines and are congruent |

linear pair | 2 adjacent angles that create a 180 degree angle |

complementary angles | 2 angles sum to 90 degrees |

supplementary angles | 2 angles sum to 180 degrees |

counterexample | example that shows a statement is false |

theorem | statement as a result of other true statements |

postulate | rules accepted without proof |

conjecture | unproven statement based on observations |

congruent | same exact size shape and/or measure |

midpoint | divides segment into 2 congruent segments |

area | square units that cover a surface |

circumference | distance around circle |

degree | measure angles and arcs |

volume | space a 3-D figure fills |

surface area | sum of all face and side areas |

perimeter | sum of lengths of all sides of a figure |

parallel | lines with same slope |

perpendicular | lines with opposite reciprocal slope |

Created by:
edenbreslauer